javascript - Jquery 下拉悬停菜单仅适用于第一个 <li>

Question

我一直在尝试让下拉悬停菜单滑下屏幕。出于某种原因，它只适用于第一个菜单项，然后其他菜单项才会出现。

我做错了什么？

$('.nav-main li ul').hide().removeClass('.drop-down');
$('.nav-main li').hover(function() {
  $('ul', this).stop().slideDown(1000);
}, function() {
  $('ul', this).stop().slideUp(1000);
});

.nav-main {
  position: absolute;
  top: 0;
  height: 65px;
  width: 100%;
  text-align: center;
}
.nav-main ul {
  position: relative;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  font-size: 22px;
  line-height: 100%;
  font-family: 'Futura W01 Bold', sans-serif;
  text-align: center;
  text-transform: uppercase;
  display: inline-block;
  width: 90%;
  height: inherit;
}
.nav-top {
  position: relative;
  margin: 0;
  padding: 0 66px 0 50px;
  float: none;
  display: inline-block;
  list-style: none;
  height: inherit;
}
.nav-top:first-child {
  padding-left: 0;
}
.nav-top:last-child {
  background-image: none;
  padding-right: 0;
}
.nav-top:last-child:after {
  content: none;
}
.nav-top > a {
  position: relative;
  display: block;
  margin: 0;
  color: #6f6f6f;
  text-decoration: none;
  padding-top: 20px;
  padding-bottom: 5px;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
.nav-top a:hover,
.nav-top.active a {
  color: #454545;
  border-bottom: 4px solid #00e9d9;
  text-decoration: none;
}
.nav-top ul {
  /*display: none;*/
  position: absolute;
  left: -8.75px;
  width: 105%;
  top: calc(100% - 1px);
}
.nav-top:hover ul {
  /*display: inline;*/
  position: absolute;
  top: calc(100% - 1px);
  left: -8.75px;
  width: 105%;
  /*-moz-transition: all 1.2s ease-in-out;
    -webkit-transition: all 1.2s ease-in-out;
    -ms-transition: all 1.2s ease-in-out;
    -o-transition: all 1.2s ease-in-out;
    transition: all 1.2s ease-in-out; */
}
.nav-top li {
  float: center;
  background-color: #e9e9e9;
  padding-top: 16px;
  padding-bottom: 16px;
}
.nav-top li > a {
  position: relative;
  display: inline;
  margin: 0;
  color: #6f6f6f;
  text-decoration: none;
  padding-top: 20px;
  padding-bottom: 5px;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
.nav-top:after {
  display: block;
  position: absolute;
  left: 100%;
  top: -17px;
  width: 22px;
  z-index: 1;
  transform: translateX(-50%);
  height: 100%;
  -ms-transform: translateX(-50%);
  -webkit-transform: translateX(-50%);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="nav-main" role="navigation">
  <ul>
    <li class="nav-top"><a href="#welcome">Welcome</a></li>
    <li class="nav-top"><a href="#about">About</a>
      <ul class="drop-down">
        <li><a href="#about">Services</a></li>
        <li><a href="#client">Clients</a></li>
        <li><a href="#press">Press</a></li>
        <li><a href="#leadership">Leadership</a></li>
        <li><a href="#twitter">Twitter</a></li>
      </ul>
    </li>
    <li class="nav-top"><a href="#contact">Contact</a></li>
  </ul>
  <span class="nav-arrow"></span>
</nav>

JSfiddle

Answer 1

从 .nav-main ul 中删除 height:inherit; 即可解决问题。问题的存在是因为下拉 .drop-down 继承了父 li 的高度，导致幻灯片动画仅对父 li 的高度进行动画处理。我希望这是有道理的。

已更新 FIDDLE .

$('.nav-main li ul').hide().removeClass('.drop-down');
$('.nav-main li').hover(
  function() {
    $('ul', this).slideDown(1000);
  },
  function() {
    $('ul', this).slideUp(1000);
  }
);

.nav-main {
  position: absolute;
  top: 0;
  height: 65px;
  width: 100%;
  text-align: center;
}
.nav-main ul {
  position: relative;
  margin: 0 auto;
  padding: 0;
  list-style: none;
  font-size: 22px;
  line-height: 100%;
  font-family: 'Futura W01 Bold', sans-serif;
  text-align: center;
  text-transform: uppercase;
  display: inline-block;
  width: 90%;
}
.nav-top {
  position: relative;
  margin: 0;
  padding: 0 66px 0 50px;
  float: none;
  display: inline-block;
  list-style: none;
  height: inherit;
  /*background: transparent url(../images/nav-divide.png) no-repeat right center;*/
}
.nav-top:first-child {
  padding-left: 0;
}
.nav-top:last-child {
  background-image: none;
  padding-right: 0;
}
.nav-top:last-child:after {
  content: none;
}
.nav-top > a {
  position: relative;
  display: block;
  margin: 0;
  color: #6f6f6f;
  text-decoration: none;
  padding-top: 20px;
  padding-bottom: 5px;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
.nav-top a:hover,
.nav-top.active a {
  color: #454545;
  border-bottom: 4px solid #00e9d9;
  text-decoration: none;
}
.nav-top ul {
  display: none;
  position: absolute;
}
.nav-top:hover ul {
  display: inline;
  position: absolute;
  top: calc(100% - 1px);
  left: -8.75px;
  width: 105%;
  /*-moz-transition: all 1.2s ease-in-out;
    -webkit-transition: all 1.2s ease-in-out;
    -ms-transition: all 1.2s ease-in-out;
    -o-transition: all 1.2s ease-in-out;
    transition: all 1.2s ease-in-out; */
}
.nav-top li {
  float: center;
  background-color: #e9e9e9;
  padding-top: 16px;
  padding-bottom: 16px;
  /*
  background: transparent url(../images/nav-divide.png) no-repeat right center;
  background: transparent url(../images/nav-divide.png) no-repeat left center;*/
}
.nav-top li > a {
  position: relative;
  display: inline;
  margin: 0;
  color: #6f6f6f;
  text-decoration: none;
  padding-top: 20px;
  padding-bottom: 5px;
  -moz-transition: all 0.3s ease;
  -ms-transition: all 0.3s ease;
  -o-transition: all 0.3s ease;
  transition: all 0.3s ease;
}
.nav-top:after {
  content: url(../images/nav-divide.png);
  display: block;
  position: absolute;
  left: 100%;
  top: -17px;
  width: 22px;
  z-index: 1;
  transform: translateX(-50%);
  height: 100%;
  -ms-transform: translateX(-50%);
  -webkit-transform: translateX(-50%);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="nav-main" role="navigation">
  <ul>
    <li class="nav-top"><a href="#welcome">Welcome</a>
    </li>
    <li class="nav-top"><a href="#about">About</a>
      <ul class="drop-down">
        <li><a href="#about">Services</a>
        </li>
        <li><a href="#client">Clients</a>
        </li>
        <li><a href="#press">Press</a>
        </li>
        <li><a href="#leadership">Leadership</a>
        </li>
        <li><a href="#twitter">Twitter</a>
        </li>
      </ul>
    </li>
    <li class="nav-top"><a href="#contact">Contact</a>
    </li>
  </ul>
  <span class="nav-arrow"></span>
</nav>